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<blockquote data-quote="Umbran" data-source="post: 5307556" data-attributes="member: 177">The scenario you show in this image is complicated, as you have two travelers who both approach the event horizon.&nbsp; It'll take me a bit to write that up properly.&nbsp; But, I can handle the next one quickly.&nbsp;Perhaps you don't understand what I mean by &quot;singularity&quot;.A black hole forms when no force known can prevent collapse.&nbsp; Not even light gets away.&nbsp; Nothing stops the collapse.&nbsp; Nothing.I repeat that - nothing.&nbsp; The thing shrinks down to the event horizon, and it keeps collapsing.&nbsp; The event horizon isn't a physical thing, it is not the surface of the collapsed object.&nbsp; It is just a demarcation line.&nbsp; The mass within continues to collapse, because there is no force in the universe that can hold it up, until it takes up zero volume.&nbsp;&nbsp; The density, therefore, is infinite - or more properly, it is undefined.&nbsp; There is no worry about the distribution of mass being uneven, as the mass isn't taking up any space!The singularity is the point (and I mean that in the literal, mathematical sense) where we divide by zero, and the normal rules of physics no longer apply.There is a volume of space between the event horizon and the singularity - all paths within the event horizon eventually lead to the singularity.</blockquote>

[QUOTE="Umbran, post: 5307556, member: 177"] The scenario you show in this image is complicated, as you have two travelers who both approach the event horizon. It'll take me a bit to write that up properly. But, I can handle the next one quickly. Perhaps you don't understand what I mean by "singularity". A black hole forms when no force known can prevent collapse. Not even light gets away. Nothing stops the collapse. Nothing. I repeat that - nothing. The thing shrinks down to the event horizon, and [i]it keeps collapsing[/i]. The event horizon isn't a physical thing, it is not the surface of the collapsed object. It is just a demarcation line. The mass within continues to collapse, because there is no force in the universe that can hold it up, until it takes up [I]zero volume[/I]. The density, therefore, is infinite - or more properly, it is undefined. There is no worry about the distribution of mass being uneven, as the mass isn't taking up any space! The singularity is the point (and I mean that in the literal, mathematical sense) where we divide by zero, and the normal rules of physics no longer apply. There is a volume of space between the event horizon and the singularity - all paths within the event horizon eventually lead to the singularity. [/QUOTE]

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